tmatsuur

<p>This plugin add the search post widget add on edit page and dashboard. Further, the edit button of previous/next post is add on edit page of the existing post.<br />
Thereby, post edit will become slightly convenient.</p>
<h4>Some features:</h4>
<ul>
<li>The retrieval by keyword of a dashboard and an edit page becomes possible.</li>
<li>The previous/next post can be edited quickly ( classic dditor only ).</li>
</ul>
<h4>Support</h4>
<ul>
<li>Japanese – https://elearn.jp/wpman/column/somewhere-search-box.html</li>
</ul>
<h4>Translators</h4>
<ul>
<li>Japanese(ja) – <a href="https://12net.jp/" rel="nofollow ugc">Takenori Matsuura</a></li>
</ul>
<p>You can send your own language pack to me.</p>
<p>Please contact to me.</p>
<ul>
<li>https://12net.jp/ (ja)</li>
<li>@tmatsuur on twitter.</li>
</ul>
<h4>Contributors</h4>
<ul>
<li><a href="https://12net.jp/" rel="nofollow ugc">Takenori Matsuura</a></li>
</ul>
<h3>Credits</h3>
<p>This plug-in is not guaranteed though the user of WordPress can freely use this plug-in free of charge regardless of the purpose.<br />
The author must acknowledge the thing that the operation guarantee and the support in this plug-in use are not done at all beforehand.</p>
<h3>Contact</h3>
<p>email to takenori.matsuura[at]gmail.com<br />
twitter @tmatsuur</p>


Somewhere search box

Search post widget and previous/next post edit button add on edit page.

joharyjoox

<p>Add an advanced data search and filter on admin page list content for each declared columns.</p>
<p>Also you can change the settings in the plugin manager admin page, to enable admin column search on specific post type and configure the search field for each column.</p>
<p>You can make search and filter on post data, post meta and terms association</p>
<p>This plugin don’t add custom columns but add search and filters features on existant columns. To add and manage custom column, please refer to the WordPress Hooks or other plugin such as CodePress Admin Columns.</p>
<h4>Localizations</h4>
<ul>
<li>English</li>
<li>French</li>
</ul>


jPress Admin Column Search

My own review

Add an advanced data search and filter on admin page list content for each declared columns.

Somewhere search box vs jPress Admin Column Search